以玉米芯炭化物为原料、KOH为活化剂，采用微波加热方式在碱炭质量比分别为1.0：1、1.5：1、2.0：1、2.5：1和3.0：1的条件下制备得到玉米芯活性炭CAC-1、CAC-1.5、CAC-2、CAC-2.5和CAC-3。采用低温N₂吸附法测试玉米芯活性炭材料的比表面积及孔径分布。三电极条件下，通过循环伏安、交流阻抗和恒流充放电测试对玉米芯活性炭材料的电容性能进行研究，结果表明，CAC-2、CAC-2.5和CAC-3具有较高的比容量和优异的倍率性能。将CAC-2、CAC-2.5和CAC-3电极片组装成扣式电容器并在电流密度为1 A/g下测试其循环性能，10 000次充放电后CAC-2的容量保持率高达99.07%。

Using carbonized corncob as raw material,KOH as activator,corncob-based activated carbon (CAC-1,CAC-1.5,CAC-2,CAC-2.5 and CAC-3) is prepared through microwave heating process under the alkali/carbon ratios of 1.0:1,1.5:1,2.0:1,2.5:1,2.5:1 and 3.0:1,respectively.The specific surface area and pore size distribution of CAC are measured by N₂ adsorption at low temperature method.The capacitive performances of CAC are evaluated by means of cyclic voltammetry,electrochemical impedance spectroscopy and galvanostatic charge-discharge tests under three electrode conditions.The results show that CAC-2,CAC-2.5 and CAC-3 have high specific capacity and excellent rate performance.CAC-2,CAC-2.5 and CAC-3 electrodes are assembled into button capacitor to test their cycling performance at a current density of 1 A·g^-1.The capacity retention rate of CAC-2 reaches 99.07% after 10 000 charge-discharge cycles.